Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19...69f&link_type=abstract
Astronomy Letters, Vol. 19, p. 69-72; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 19, no. 3, p. 172-180. In Russia
Astronomy and Astrophysics
Astronomy
2
Magellanic Clouds, Radiant Flux Density, Supernova 1987A, X Ray Astronomy, Stellar Envelopes, Stellar Luminosity, Stellar Spectra
Scientific paper
LMC observations with the SIGMA telescope of the Granat observatory failed to reveal a statistically significant flux in the hard X-ray range from any of the 97 sources observed by the Einstein observatory in the soft X-ray range of 0.15-4.5 KeV, with the possible exception of CAL 87. The sensitivity (3 sigma) achieved in the survey corresponds to 6 x 10 exp 37 ergs/s in the 40-150 keV band (assuming a 55-kpc distance to the LMC). This luminosity would correspond to a source several times brighter than the well-known black hole candidate Cyg X-1. Upper limits for the flux from such sources in the LMC as LMC X-1 and LMC X-4 are presented. The number of radioactive elements in the envelope of SN 1987A is limited to 0.0024 solar mass for Na-22 and 0.023 solar mass for Ti-44.
Churazov Eugene
Claret Antonio
Finoguenov Alexis
Gilfanov Marat
Goldwurm Andréa
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